Rainshow'r - CQ 1000 MS Shower Filter with Massaging Shower Head 6-9 Months FILTERED WATER - Traps particulate matter that would otherwise mix with the medias and reduce their effectiveness. Its specially-formulated KDF-55 filter media effectively removes 90% or more of chlorine from shower water. GOOD FOR YOUR BODY  Reduces fading of color treated-hair & provides relief from dry skin and scalp. Helps make hair more manageable, while keeping softer, younger looking skin LONG LASTING - Lasts 6-9 Months or up to 25000 Gallons. NSF CERTIFIED- CQ-1000 has been tested and certified by the Water Quality Association and meets NSF Standard 177 for Reduction of Free Chlorine ENVIRONMENTALLY SAFE - Destabilizes the free chlorine and turns it into a harmless chloride. Once in contact with the KDF-55, chlorine in the water converts into an environmentally safe and harmless soluble chloride.